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William Sommerwerck William Sommerwerck is offline
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Default What is the fifth transistor likely for?

There shouldn't be a need to compensate for temps in
something that doesn't put out a lot of wattage in the
first place.


Not so -- not for germanium transistors, anyway, which were very
temperature-sensitive. Look at the schematic for any early transistor
radio -- there's a diode or thermistor in the output stage.

I was the first to suggest temperature compensation -- but also pointed out
it was unlikely.